Nodejs Passport authentication & local strategy not work through API Call - node.js

Question

This is solved. Actually, the problem is with postman not on Passport code
I have a login system which is implemented through Nodejs Passport. For Login I use Handlebars for creating the UI and send the form data from frontend to backend.
These is my login Handlebars File
<form id="userloginform" method="post" action="/user/login">
<div class="form-group">
<label>Username</label>
<input type="text" name="username" class="form-control" placeholder="Username or Email">
</div>
<div class="form-group">
<label>Password</label>
<input type="password" name="password" class="form-control" placeholder="Password">
</div>
<button type="submit" class="btn btn-primary">Submit</button>
</form>
and on User.js file I have a code of authentication i.e like this
//Login Handler
passport.use('local-user', new LocalStrategy(
function(username, password, done) {
User.getUserByUsername(username, function(err, user){
if(err) {
console.log('error')
logger.log('error', 'Error Generates on User.getUserByUsername Query on users.js file');
throw err;
}
if(!user){
return done(null, false, {message: 'Unknown User'});
}
User.comparePassword(password, user.password, function(err, isMatch){
if(err) {
logger.log('error', 'Error Generates on User.comparePassword Query on users.js file');
throw err;
}
if(isMatch){
return done(null, user);
}else{
return done(null, false, {message: 'Invalid Credential, please check carefully...!'})
}
});
});
}
));
//Login Authentication
router.post('/login',
passport.authenticate('local-user', {
failureRedirect: '/user/login',
badRequestMessage: 'Field cannot be blank.!!', //missing credentials
failureFlash: true
}),
function(req, res) {
console.log('hello');
req.flash('success_msg', 'Welcome ' + req.user.name);
req.flash('custom_msg', token);
//res.redirect('/success?username='+req.user.username);
res.redirect('/user/dashboard');
});
All these things are working pefectly.
Now when I call it through postman and pass two parameters i.e username and password then it does nothing. Simply failure redirect.
I have done this through proper nodejs with form submitted pattern. Now I want to be done through API from different Server.
Anyone have any idea then let me know. Any help is really appreciated.